I'm trying to find completely privately funded studies on climate change, but am unable to find any. If anybody knows of any studies that were carried out without government grants or with little public assistance, I would greatly appreciate it.
Check out (Goggle) on Munich RE and their various climate change documents and presentations. Munich RE is a major insurance company that insures most of the world's insurance companies.
In addition, organizations like the World Bank and Deutsche Bank also have climate change white papers that are generally informative.
In addition to the Heartland Institute mentioned above, there are similar other think tanks that more or less consistently challenge humans caused climate change: